| Smilepod Group Limited | Administrative & support | 2010 |
| Smilepod Limited | Health & social care | 2008 |
| Smirsh Limited | Professional & scientific | 2005 |
| Smith & Fraser Limited | Information & communication | 2026 |
| Smith Electrical Contractors Limited | Construction | 2007 |
| Smith Street Films Ltd | Information & communication | 2022 |
| Smith Ventures Ltd | Administrative & support | 2019 |
| Smith's Premium Properties Ltd | Real estate | 2020 |
| SMM Mechanical Engineering Ltd | Wholesale & retail | 2023 |
| SMO Logistics Limited | Transport & logistics | 2024 |
| SMS Subsea Limited | Manufacturing | 2026 |
| SMS USA Limited | Professional & scientific | 2024 |
| Smsb Networks Ltd | Information & communication | 2022 |
| Smudgers Limited | Education | 2022 |
| Smyth Connect Limited | Professional & scientific | 2025 |
| SNA Insights Limited | Professional & scientific | 2025 |
| SNC Forestry Limited | Agriculture & fishing | 2004 |
| SND Oriental Shop Ltd | Wholesale & retail | 2020 |
| Snellings Communications Limited | Information & communication | 2012 |
| Snowbell Care Ltd | Health & social care | 2025 |
| Snowbot Limited | Information & communication | 2014 |
| Snowcap Bangles Limited | Manufacturing | 2002 |
| SO Professional Events Limited | Administrative & support | 2017 |
| SO Professional Health & Safety Ltd | Professional & scientific | 2013 |
| So-Am Ltd | Manufacturing | 2024 |
| So-Green Properties Ltd | Real estate | 2017 |
| Soccer Scholar Academy Limited | Arts & recreation | 2015 |
| Social Bella Ltd | Professional & scientific | 2024 |
| Social EGG Freeze Limited | Wholesale & retail | 2024 |
| Soco Quarters Ltd | Real estate | 2022 |
| Socrates Holdco Limited | Financial services | 2026 |
| Sodha Mills Ltd | Wholesale & retail | 2025 |
| SOFTHUB4CREATIVES Ltd | Wholesale & retail | 2024 |
| Software With a Service Company Ltd | Professional & scientific | 2023 |
| Soho Solutions Ltd | Professional & scientific | 2024 |
| Sojourn Enterprises Limited | Construction | 2021 |
| Solace Marine Engineering Ltd | Professional & scientific | 2014 |
| Solar Compare UK Ltd | Wholesale & retail | 2024 |
| Solaris Care Ltd | Health & social care | 2023 |
| Solaris Electronics Ltd | Wholesale & retail | 2012 |
| Solaris Law (Commercial) Limited | Professional & scientific | 2024 |
| Solaris Law Ltd | Professional & scientific | 2019 |
| Solaris Recruitment Ltd | Administrative & support | 2023 |
| Solas Yachts Ltd | Transport & logistics | 2024 |
| Solent (UK) Limited | Wholesale & retail | 1999 |
| Solent 2 Business Park Management Company Limited | Other services | 2006 |
| Solent Accountants Limited | Professional & scientific | 2009 |
| Solent Adventure Golf Limited | Arts & recreation | 2014 |
| Solent Air Charters Limited | Extraterritorial | 2017 |
| Solent Air Source Ltd | Wholesale & retail | 2024 |
| Solent Austin Seven Club Limited | Other services | 1980 |
| Solent Aviation Services Ltd | Professional & scientific | 2015 |
| Solent Bodybuilders & Repairs Limited | Manufacturing | 1971 |
| Solent Cartridge Supplies Ltd | Administrative & support | 2007 |
| Solent Cliffs Nursing Home Limited | Health & social care | 1999 |
| Solent Commercial Vehicle Services Limited | Financial services | 2019 |
| Solent Contract Flooring Ltd | Construction | 2006 |
| Solent Contracts Limited | Construction | 2018 |
| Solent Cooling Solutions Ltd | Construction | 2018 |
| Solent Cycles Limited | Wholesale & retail | 2008 |
| Solent Design & Build Ltd | Construction | 2017 |
| Solent Distribution Ltd | Professional & scientific | 2026 |
| Solent Excavations Limited | Construction | 1976 |
| Solent Family Martial Arts Ltd | Arts & recreation | 2019 |
| Solent Glass and Glazing Limited | Manufacturing | 1985 |
| Solent Grabs Ltd | Transport & logistics | 2024 |
| Solent Groundworks Limited | Construction | 1994 |
| Solent Heating Ltd | Construction | 2015 |
| Solent Hydrotherapy & Rehabilitation Centre Ltd | Health & social care | 2023 |
| Solent Martial Arts Academy Limited | Arts & recreation | 2010 |
| Solent News Limited | Wholesale & retail | 2003 |
| Solent Nightz Limited | Real estate | 2006 |
| Solent Parkway (1630) Management Limited | Construction | 1987 |
| Solent Print Finish Limited | Manufacturing | 2016 |
| Solent Property Ltd | Real estate | 2017 |
| Solent Property Maintenance Limited | Construction | 2022 |
| Solent Recruitment Limited | Administrative & support | 2016 |
| Solent Safety Services Ltd | Professional & scientific | 2009 |
| Solent Shading Ltd | Construction | 2024 |
| Solent Shores Management Company Limited | Professional & scientific | 2014 |
| Solent Solar Ltd | Construction | 2022 |
| Solent Spares Holdings Limited | Real estate | 2014 |
| Solent Specialist Physiotherapy Limited | Health & social care | 2024 |
| Solent Studios Limited | Wholesale & retail | 2026 |
| Solent Timber Frames Limited | Manufacturing | 2025 |
| Solent Transport Consultants Ltd | Professional & scientific | 2021 |
| Solent Truck Parts Limited | Wholesale & retail | 1999 |
| Solent Vascular Care Limited | Health & social care | 2012 |
| Solent Vehicle Sales Limited | Wholesale & retail | 2018 |
| Solent View Limited | Professional & scientific | 2025 |
| Solent Welding & Fabrication Limited | Manufacturing | 2008 |
| Solent Worktops Limited | Other services | 2019 |
| Solex Commodities Limited | Professional & scientific | 2011 |
| Solid Stock Ltd | Arts & recreation | 2024 |
| Solidus & Aqua Ltd | Professional & scientific | 2025 |
| Solihull Specsavers Hearcare Limited | Wholesale & retail | 2002 |
| Solihull Specsavers Limited | Wholesale & retail | 1993 |
| Solihull Visionplus Limited | Wholesale & retail | 1993 |
| Solo Bidco Limited | Financial services | 2019 |
| Solo Developments Limited | Real estate | 2021 |